From e7907c494f7f78831c2e2d523f7eb43e25ee77c0 Mon Sep 17 00:00:00 2001 From: Berthold Stoeger Date: Thu, 7 Jan 2021 14:38:37 +0100 Subject: statistics: convert chart to QQuickItem It turns out that the wrong base class was used for the chart. QQuickWidget can only be used on desktop, not in a mobile UI. Therefore, turn this into a QQuickItem and move the container QQuickWidget into desktop-only code. Currently, this code is insane: The chart is rendered onto a QGraphicsScene (as it was before), which is then rendered into a QImage, which is transformed into a QSGTexture, which is then projected onto the device. This is performed on every mouse move event, since these events in general change the position of the info-box. The plan is to slowly convert elements such as the info-box into QQuickItems. Browsing the QtQuick documentation, this will not be much fun. Also note that the rendering currently tears, flickers and has antialiasing artifacts, most likely owing to integer (QImage) to floating point (QGraphicsScene, QQuickItem) conversion problems. The data flow is QGraphicsScene (float) -> QImage (int) -> QQuickItem (float). Signed-off-by: Berthold Stoeger --- backend-shared/roundrectitem.cpp | 4 ++++ backend-shared/roundrectitem.h | 1 + 2 files changed, 5 insertions(+) (limited to 'backend-shared') diff --git a/backend-shared/roundrectitem.cpp b/backend-shared/roundrectitem.cpp index 2dbfd7b03..52200b017 100644 --- a/backend-shared/roundrectitem.cpp +++ b/backend-shared/roundrectitem.cpp @@ -7,6 +7,10 @@ RoundRectItem::RoundRectItem(double radius, QGraphicsItem *parent) : QGraphicsRe { } +RoundRectItem::RoundRectItem(double radius) : RoundRectItem(radius, nullptr) +{ +} + void RoundRectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *) { painter->save(); diff --git a/backend-shared/roundrectitem.h b/backend-shared/roundrectitem.h index d3f58782f..b8cb3f89b 100644 --- a/backend-shared/roundrectitem.h +++ b/backend-shared/roundrectitem.h @@ -7,6 +7,7 @@ class RoundRectItem : public QGraphicsRectItem { public: RoundRectItem(double radius, QGraphicsItem *parent); + RoundRectItem(double radius); private: void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override; double radius; -- cgit v1.2.3-70-g09d2